Doctrine, ingame, is essentially a representation of what a given nation's officer schools choose to teach their officers.
This was very narrow in the time frame (and still is, to a great degree), became even more narrow during the war (less time available = less taught), and is a entirely separate concept from "knowhow" - i.e. experience gained in war.
Experience in war can lead to alterations in doctrine (and this type of choice should also be represented), but almost never wholesale changeover. Overall I agree that national doctrines were in large part defined prewar. Very few nations would change their primary focus, they merely adapted their doctrines to new situations.
For instance rather than shifting wholesale to German-style mobile warfare, the USSR applied a new level of mobility to their concept of 'mass', which predated the war by a century or more, and continues to this day.
Similarly, the UK stuck to its focus on the set-piece battle, while incorporating new more mobile elements into it, along with an American-derived emphasis on firepower supremacy.
As for the specific OP about doctrines as sliders (more properly termed 'variables'), I think there is great promise but the idea needs to be fleshed out more fully. Variables can be a powerful tool for a more realistic progression in many aspects of the game, but the interrelationship between the different variables has to be worked out for it to take shape.
I have one specific idea at this time: I think a nation's allies & enemies could have a small effect on these variables - for instance a nation fighting heavily against Germany would learn about mobility bit by bit, while a nation allied with & fighting alongside the US would learn about firepower supremacy bit by bit, and what they learned would slowly enter the realm of doctrine.
This was very narrow in the time frame (and still is, to a great degree), became even more narrow during the war (less time available = less taught), and is a entirely separate concept from "knowhow" - i.e. experience gained in war.
Experience in war can lead to alterations in doctrine (and this type of choice should also be represented), but almost never wholesale changeover. Overall I agree that national doctrines were in large part defined prewar. Very few nations would change their primary focus, they merely adapted their doctrines to new situations.
For instance rather than shifting wholesale to German-style mobile warfare, the USSR applied a new level of mobility to their concept of 'mass', which predated the war by a century or more, and continues to this day.
Similarly, the UK stuck to its focus on the set-piece battle, while incorporating new more mobile elements into it, along with an American-derived emphasis on firepower supremacy.
As for the specific OP about doctrines as sliders (more properly termed 'variables'), I think there is great promise but the idea needs to be fleshed out more fully. Variables can be a powerful tool for a more realistic progression in many aspects of the game, but the interrelationship between the different variables has to be worked out for it to take shape.
I have one specific idea at this time: I think a nation's allies & enemies could have a small effect on these variables - for instance a nation fighting heavily against Germany would learn about mobility bit by bit, while a nation allied with & fighting alongside the US would learn about firepower supremacy bit by bit, and what they learned would slowly enter the realm of doctrine.